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[PATCH v3 5/9] irqchip/renesas-rzg2l: Implement restriction when writing ISCR register

Claudiu posted 9 patches 2 years ago
[PATCH v3 5/9] irqchip/renesas-rzg2l: Implement restriction when writing ISCR register
Posted by Claudiu 2 years ago 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

The RZ/G2L manual (chapter "IRQ Status Control Register (ISCR)") describes
the operation to clear interrupts through the ISCR register as follows:

[Write operation]
When "Falling-edge detection", "Rising-edge detection" or
"Falling/Rising-edge detection" is set in IITSR:
- In case ISTAT is 1
	0: IRQn interrupt detection status is cleared.
	1: Invalid to write.
- In case ISTAT is 0
	Invalid to write.

When “Low-level detection” is set in IITSR.:
	Invalid to write.

Take the interrupt type into account when clearing interrupts through
the ISCR register to avoid writing the ISCR when interrupt type is
level.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
 drivers/irqchip/irq-renesas-rzg2l.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index d666912adc74..a77ac6e1606f 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -78,11 +78,17 @@ static void rzg2l_irq_eoi(struct irq_data *d)
 	unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
 	struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
 	u32 bit = BIT(hw_irq);
-	u32 reg;
+	u32 iitsr, iscr;
 
-	reg = readl_relaxed(priv->base + ISCR);
-	if (reg & bit)
-		writel_relaxed(reg & ~bit, priv->base + ISCR);
+	iscr = readl_relaxed(priv->base + ISCR);
+	iitsr = readl_relaxed(priv->base + IITSR);
+
+	/*
+	 * ISCR can only be cleared if the type is falling-edge, rising-edge or
+	 * falling/rising-edge.
+	 */
+	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
+		writel_relaxed(iscr & ~bit, priv->base + ISCR);
 }
 
 static void rzg2l_tint_eoi(struct irq_data *d)
-- 
2.39.2
Re: [PATCH v3 5/9] irqchip/renesas-rzg2l: Implement restriction when writing ISCR register
Posted by Geert Uytterhoeven 2 years ago 
On Mon, 20 Nov 2023, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>
> The RZ/G2L manual (chapter "IRQ Status Control Register (ISCR)") describes
> the operation to clear interrupts through the ISCR register as follows:
>
> [Write operation]
> When "Falling-edge detection", "Rising-edge detection" or
> "Falling/Rising-edge detection" is set in IITSR:
> - In case ISTAT is 1
> 	0: IRQn interrupt detection status is cleared.
> 	1: Invalid to write.
> - In case ISTAT is 0
> 	Invalid to write.
>
> When “Low-level detection” is set in IITSR.:
> 	Invalid to write.
>
> Take the interrupt type into account when clearing interrupts through
> the ISCR register to avoid writing the ISCR when interrupt type is
> level.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

 						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
 							    -- Linus Torvalds
[tip: irq/core] irqchip/renesas-rzg2l: Implement restriction when writing ISCR register
Posted by tip-bot2 for Claudiu Beznea 2 years ago 
The following commit has been merged into the irq/core branch of tip:

Commit-ID:     ef88eefb1a81a8701eabb7d5ced761a66a465a49
Gitweb:        https://git.kernel.org/tip/ef88eefb1a81a8701eabb7d5ced761a66a465a49
Author:        Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
AuthorDate:    Mon, 20 Nov 2023 13:18:16 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 12 Dec 2023 15:40:41 +01:00

irqchip/renesas-rzg2l: Implement restriction when writing ISCR register

The RZ/G2L manual (chapter "IRQ Status Control Register (ISCR)") describes
the operation to clear interrupts through the ISCR register as follows:

[Write operation]

  When "Falling-edge detection", "Rising-edge detection" or
  "Falling/Rising-edge detection" is set in IITSR:

    - In case ISTAT is 1
	0: IRQn interrupt detection status is cleared.
	1: Invalid to write.
    - In case ISTAT is 0
	Invalid to write.

  When "Low-level detection" is set in IITSR.:
        Invalid to write.

Take the interrupt type into account when clearing interrupts through the
ISCR register to avoid writing the ISCR when the interrupt type is level.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231120111820.87398-6-claudiu.beznea.uj@bp.renesas.com

---
 drivers/irqchip/irq-renesas-rzg2l.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index 0a77927..d450417 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -78,11 +78,17 @@ static void rzg2l_irq_eoi(struct irq_data *d)
 	unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
 	struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
 	u32 bit = BIT(hw_irq);
-	u32 reg;
+	u32 iitsr, iscr;
 
-	reg = readl_relaxed(priv->base + ISCR);
-	if (reg & bit)
-		writel_relaxed(reg & ~bit, priv->base + ISCR);
+	iscr = readl_relaxed(priv->base + ISCR);
+	iitsr = readl_relaxed(priv->base + IITSR);
+
+	/*
+	 * ISCR can only be cleared if the type is falling-edge, rising-edge or
+	 * falling/rising-edge.
+	 */
+	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
+		writel_relaxed(iscr & ~bit, priv->base + ISCR);
 }
 
 static void rzg2l_tint_eoi(struct irq_data *d)
[tip: irq/core] irqchip/renesas-rzg2l: Implement restriction when writing ISCR register
Posted by tip-bot2 for Claudiu Beznea 2 years ago 
The following commit has been merged into the irq/core branch of tip:

Commit-ID:     0b57d3bb1cc5da335fd4c7a4b1996e7015f4b5d5
Gitweb:        https://git.kernel.org/tip/0b57d3bb1cc5da335fd4c7a4b1996e7015f4b5d5
Author:        Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
AuthorDate:    Mon, 20 Nov 2023 13:18:16 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Fri, 08 Dec 2023 22:06:35 +01:00

irqchip/renesas-rzg2l: Implement restriction when writing ISCR register

The RZ/G2L manual (chapter "IRQ Status Control Register (ISCR)") describes
the operation to clear interrupts through the ISCR register as follows:

[Write operation]

  When "Falling-edge detection", "Rising-edge detection" or
  "Falling/Rising-edge detection" is set in IITSR:

    - In case ISTAT is 1
	0: IRQn interrupt detection status is cleared.
	1: Invalid to write.
    - In case ISTAT is 0
	Invalid to write.

  When "Low-level detection" is set in IITSR.:
        Invalid to write.

Take the interrupt type into account when clearing interrupts through the
ISCR register to avoid writing the ISCR when the interrupt type is level.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231120111820.87398-6-claudiu.beznea.uj@bp.renesas.com

---
 drivers/irqchip/irq-renesas-rzg2l.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index 0a77927..d450417 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -78,11 +78,17 @@ static void rzg2l_irq_eoi(struct irq_data *d)
 	unsigned int hw_irq = irqd_to_hwirq(d) - IRQC_IRQ_START;
 	struct rzg2l_irqc_priv *priv = irq_data_to_priv(d);
 	u32 bit = BIT(hw_irq);
-	u32 reg;
+	u32 iitsr, iscr;
 
-	reg = readl_relaxed(priv->base + ISCR);
-	if (reg & bit)
-		writel_relaxed(reg & ~bit, priv->base + ISCR);
+	iscr = readl_relaxed(priv->base + ISCR);
+	iitsr = readl_relaxed(priv->base + IITSR);
+
+	/*
+	 * ISCR can only be cleared if the type is falling-edge, rising-edge or
+	 * falling/rising-edge.
+	 */
+	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
+		writel_relaxed(iscr & ~bit, priv->base + ISCR);
 }
 
 static void rzg2l_tint_eoi(struct irq_data *d)

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